A crested gecko's normal build
A crested gecko in good condition is soft-bodied but streamlined: the head is wide and triangular, the body behind it slightly narrower, and the skin sits smooth without folds when the gecko stretches out on glass. Viewed from above, the outline should flow from head to hips without a mid-body swell. Crested geckos feel delicate compared with ground geckos, so the changes of overfeeding are subtle at first — a plumpness that owners read as a healthy, well-grown adult until the folds arrive.
Folds, bulges and the untouched cup
Fat on a crested gecko collects under the chin as a small dewlap, behind the front legs, and along the flanks, where it shows as gentle bulges and creases when the gecko curls on a leaf. The tail base thickens, and the body from above can look wider than the broad head — a reliable sign, since a fit crested gecko's head is its widest point. Behaviour shifts too: a heavy gecko climbs and jumps less, preferring low, sturdy perches, because leaping between branches is harder work with extra grams aboard. The most practical clue sits in the food cup: a gecko offered fresh diet nightly that barely licks it is not a picky eater, it is a full one.
Why nightly cups overdo it
In the wild, a crested gecko works for fruit, nectar and insects across a whole night of climbing. In a vivarium, a complete powdered diet — mixed fresh and set in a raised cup — is richer and far easier to reach. Juveniles eat most days and grow fast, but adults maintain themselves comfortably with the diet offered every other day, or even every third day for a gecko carrying extra weight. The common mistakes are a heaped cup every single night, sweet fruit baby-food style extras, and insects at every sitting. Each one alone is small; together they quietly double what an adult crested gecko needs.
Resetting the rota for a heavy crested gecko
Move an adult crested gecko to fresh diet on alternate evenings, mixed to the usual consistency and served in a modest amount — enough that some remains in the morning, never a brimming cup. Offer insects once a week at most while weight is coming down, a few appropriately sized ones rather than a free-for-all. Weigh the gecko every fortnight if it will sit on a scale; a slow downward drift over a couple of months, with the chin fold shrinking, is the goal, not a rapid drop. Keep misting and foliage cover exactly as they are — hydration and security are not part of the diet, and a stressed gecko hiding all night will simply eat the same and move even less.
When a plump crested gecko needs a vet
See a reptile vet if a crested gecko's jaw looks soft or rubbery, if it trembles, if its tail kinks or its spine curves, or if it stops eating altogether for an extended stretch. Those signs point beyond simple overfeeding toward problems a diet change cannot fix. A one-sided swelling, retained shed that will not clear, or prolapse also needs prompt hands-on care. If the check comes back as plain condition, the alternate-day rota is the long-term answer — and logging each cup on KinsLe's Care Teams, marked done with the time, keeps partners, family and sitters from each kindly feeding the gecko on the same night.